Flutter: Stably Ramp Websdk inside WebViewWidget example

ramp-webview.widget.dart

import 'package:flutter/material.dart';
import 'package:flutter_custom_tabs/flutter_custom_tabs.dart';
import 'package:webview_flutter/webview_flutter.dart';

class RampWidget extends StatefulWidget {
  const RampWidget({super.key});

  @override
  State<RampWidget> createState() => _RampWidgetState();
}

class _RampWidgetState extends State<RampWidget> {
  late final WebViewController _controller;

  @override
  void initState() {
    super.initState();

    _controller = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setBackgroundColor(const Color(0x00000000))
      ..setNavigationDelegate(
        NavigationDelegate(
          onProgress: (int progress) {},
          onPageStarted: (String url) {},
          onPageFinished: (String url) {},
          onWebResourceError: (WebResourceError error) {},
          onNavigationRequest: (NavigationRequest request) {
            if (request.url !== 'about:blank' && !request.url.contains('stably.io') &&
                (request.url.contains('socure.com') ||
                    request.url.contains('plaid.com'))) {
              launch(request.url);
              return NavigationDecision.prevent;
            }
            return NavigationDecision.navigate;
          },
        ),
      )
      ..loadRequest(
        Uri.parse(
          'https://ramp-beta.stably.io/?integrationId=test_younis_flutter',
        ),
      );
  }

  @override
  Widget build(BuildContext context) {
    // _launchRamp(context);
    return Container(
      alignment: Alignment.center,
      child: WebViewWidget(controller: _controller),
    );
  }

  void _launchUrl(BuildContext context, String url) async {
    try {
      await launch(
        url,
        customTabsOption: CustomTabsOption(
          toolbarColor: Theme.of(context).primaryColor,
          enableDefaultShare: false,
          enableUrlBarHiding: true,
          showPageTitle: true,
          animation: CustomTabsSystemAnimation.fade(),
          extraCustomTabs: const <String>[
            // ref. https://play.google.com/store/apps/details?id=org.mozilla.firefox
            'org.mozilla.firefox',
            // ref. https://play.google.com/store/apps/details?id=com.microsoft.emmx
            'com.microsoft.emmx',
          ],
        ),
        safariVCOption: SafariViewControllerOption(
          preferredBarTintColor: Theme.of(context).primaryColor,
          preferredControlTintColor: Colors.white,
          barCollapsingEnabled: true,
          entersReaderIfAvailable: false,
          dismissButtonStyle: SafariViewControllerDismissButtonStyle.close,
        ),
      );
    } catch (e) {
      // An exception is thrown if browser app is not installed on Android device.
      debugPrint(e.toString());
    }
  }
}